14 June 2001 Smart wide-area imaging sensor system (SWISS)
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For some structural components conventional methods of loads and usage monitoring, supplemented by on ground NDT measurements to detect damages can be unsatisfying due to various reasons: low reliability of sensing technique or low accessibility and sometimes high cost of dismantling for regular NDT. Sensor methodologies having evolved form conventional ultrasonic inspection in principle have the potential to detect damages in various types of structures: 2D, 3D, metal, composite - provided significant interaction of ultrasonic waves with local damage is given. SWISS (Smart Wide-area Imaging Sensor System) requires a physical interaction model of ultrasonic excitation with structure and its potential damage and merges sensor data to determine spatial distribution of impedance by imaging which performs localization and sizing of damage in one. Second: use of signal and image processing techniques to alert when damage becomes critical. SWISS has been designed by EADS to image various types of damage from considerate distance by means of permanently installed piezo-elements. SWISS features a sensor minimization to achieve low weight and still high reliability and the use of cheap electronics but clever testing and analyzing to achieve low cost for in-service application. SIEMENS NDT has been able to demonstrate SWISS functionality on complex components by appropriate use of Phased Arrays.
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Klaus-Peter Kress, Klaus-Peter Kress, Kay W. Dittrich, Kay W. Dittrich, Guenther Guse, Guenther Guse, } "Smart wide-area imaging sensor system (SWISS)", Proc. SPIE 4332, Smart Structures and Materials 2001: Industrial and Commercial Applications of Smart Structures Technologies, (14 June 2001); doi: 10.1117/12.429691; https://doi.org/10.1117/12.429691

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